Outliner: Synced selection and active element highlighting

Adds a toggle to the filter menu for outliner synced selection. Enabled
by default, this ensures selection is synced between objects, bones, and
sequences. An active outliner element theme color is added to indicate
which element is active.

Synced selection is controlled on the operator level. Each operator
that modifies selection for objects, bones, sequences, or outliner
elements needs to call the respective ED_outliner_select_sync_from..
function to tag outliners to be synced.

Syncing is done lazily on outliner draw.

2 files changed, 22 insertions, 0 deletions

diff --git a/source/blender/editors/object/object_add.c b/source/blender/editors/object/object_add.c
index 7e031866dec..80d150506ad 100644
--- a/source/blender/editors/object/object_add.c
+++ b/source/blender/editors/object/object_add.c
@@ -103,6 +103,7 @@
 #include "ED_mesh.h"
 #include "ED_node.h"
 #include "ED_object.h"
+#include "ED_outliner.h"
 #include "ED_physics.h"
 #include "ED_render.h"
 #include "ED_screen.h"
@@ -502,6 +503,8 @@ Object *ED_object_add_type(bContext *C,
   /* TODO(sergey): Use proper flag for tagging here. */
   DEG_id_tag_update(&scene->id, 0);
 
+  ED_outliner_select_sync_from_object_tag(C);
+
   return ob;
 }
 
diff --git a/source/blender/editors/object/object_select.c b/source/blender/editors/object/object_select.c
index da06707ebac..28242b986f1 100644
--- a/source/blender/editors/object/object_select.c
+++ b/source/blender/editors/object/object_select.c
@@ -69,6 +69,7 @@
 
 #include "ED_armature.h"
 #include "ED_object.h"
+#include "ED_outliner.h"
 #include "ED_screen.h"
 #include "ED_select_utils.h"
 #include "ED_keyframing.h"
@@ -436,6 +437,8 @@ static int object_select_by_type_exec(bContext *C, wmOperator *op)
   DEG_id_tag_update(&scene->id, ID_RECALC_SELECT);
   WM_event_add_notifier(C, NC_SCENE | ND_OB_SELECT, scene);
 
+  ED_outliner_select_sync_from_object_tag(C);
+
   return OPERATOR_FINISHED;
 }
 
@@ -717,6 +720,7 @@ static int object_select_linked_exec(bContext *C, wmOperator *op)
   if (changed) {
     DEG_id_tag_update(&scene->id, ID_RECALC_SELECT);
     WM_event_add_notifier(C, NC_SCENE | ND_OB_SELECT, scene);
+    ED_outliner_select_sync_from_object_tag(C);
     return OPERATOR_FINISHED;
   }
 
@@ -1100,6 +1104,7 @@ static int object_select_grouped_exec(bContext *C, wmOperator *op)
   if (changed) {
     DEG_id_tag_update(&scene->id, ID_RECALC_SELECT);
     WM_event_add_notifier(C, NC_SCENE | ND_OB_SELECT, scene);
+    ED_outliner_select_sync_from_object_tag(C);
     return OPERATOR_FINISHED;
   }
 
@@ -1150,6 +1155,8 @@ static int object_select_all_exec(bContext *C, wmOperator *op)
     DEG_id_tag_update(&scene->id, ID_RECALC_SELECT);
     WM_event_add_notifier(C, NC_SCENE | ND_OB_SELECT, scene);
 
+    ED_outliner_select_sync_from_object_tag(C);
+
     return OPERATOR_FINISHED;
   }
   else if (any_visible == false) {
@@ -1218,6 +1225,8 @@ static int object_select_same_collection_exec(bContext *C, wmOperator *op)
   DEG_id_tag_update(&scene->id, ID_RECALC_SELECT);
   WM_event_add_notifier(C, NC_SCENE | ND_OB_SELECT, scene);
 
+  ED_outliner_select_sync_from_object_tag(C);
+
   return OPERATOR_FINISHED;
 }
 
@@ -1281,6 +1290,8 @@ static int object_select_mirror_exec(bContext *C, wmOperator *op)
   DEG_id_tag_update(&scene->id, ID_RECALC_SELECT);
   WM_event_add_notifier(C, NC_SCENE | ND_OB_SELECT, scene);
 
+  ED_outliner_select_sync_from_object_tag(C);
+
   return OPERATOR_FINISHED;
 }
 
@@ -1369,6 +1380,9 @@ static int object_select_more_exec(bContext *C, wmOperator *UNUSED(op))
     Scene *scene = CTX_data_scene(C);
     DEG_id_tag_update(&scene->id, ID_RECALC_SELECT);
     WM_event_add_notifier(C, NC_SCENE | ND_OB_SELECT, scene);
+
+    ED_outliner_select_sync_from_object_tag(C);
+
     return OPERATOR_FINISHED;
   }
   else {
@@ -1399,6 +1413,9 @@ static int object_select_less_exec(bContext *C, wmOperator *UNUSED(op))
     Scene *scene = CTX_data_scene(C);
     DEG_id_tag_update(&scene->id, ID_RECALC_SELECT);
     WM_event_add_notifier(C, NC_SCENE | ND_OB_SELECT, scene);
+
+    ED_outliner_select_sync_from_object_tag(C);
+
     return OPERATOR_FINISHED;
   }
   else {
@@ -1448,6 +1465,8 @@ static int object_select_random_exec(bContext *C, wmOperator *op)
   DEG_id_tag_update(&scene->id, ID_RECALC_SELECT);
   WM_event_add_notifier(C, NC_SCENE | ND_OB_SELECT, scene);
 
+  ED_outliner_select_sync_from_object_tag(C);
+
   return OPERATOR_FINISHED;
 }